* Howard Stark as a series regular. Dominic Cooper has expressed serious interest stating he'd definitely be up for it. Based on his comments, I think they might have already signed Cooper behind the scenes.
* Howling Commandos! A press release in the near future stating "Kenneth Choi, Derek Luke, JJ Feild, Bruno Ricci and Neal McDonough reprise their roles as members of Captain America's Howling Commandos in
Marvel's Agent Carter on ABC..." would have me absolutely leaping for joy. Someone look up what those actors are up to these days.
* Tommy Lee Jones. I know, he might be too big a star to "slum it" on network TV, but even a few guest appearances would be awesome.
* Random Winter Soldier attacks interspersed here and there. Wouldn't want him to be a constant threat, but possibly an enigmatic enemy that shows up when least expected and causes havoc. The dynamic would be wonderful since the audience would know exactly what's going on, but the show's SHIELD agents would be completely in the dark. Though, this could be saved for season 2.
* The "rehabilitation" of one Dr. Arnim Zola, planting seeds of corruption in SHIELD's core. Again, could be saved for season 2.
* Agent Carter sub-forum on SuperHeroHype.
That's all I have off the top of my head. Thoughts, anyone?